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All-optical processing and generation are regarded as a key solution to achieve ultrahigh bitrate communication in next generation. Silicon based optical waveguides have been widely developed, including ultrafast electrical-optical modulator, splitter, wavelength generator, and etc. However, the carrier relaxation issues as well as inevitable two-photon absorption in communication regions limit its...
The degenerate four-wave-mixing (DFWM) effect in Si quantum dot doped SiNx (SiNx:Si-QD) channel waveguide has been preliminarily demonstrated. By enhancing the optical nonlinearity of SiNx at 1550 nm with doped Si-QDs, the DFWM can be enhanced with its conversion efficiency of −46 dB in the SiNx :Si-QD channel waveguide with length of 8 mm. The nonlinear refractive index of the SiNx:Si-QD is estimated...
The low-loss and CMOS compatible Ta2O5 based optical waveguide has been demonstrated. The quality factor of 50,000 in the Ta2O5 micro-ring resonator is fabricated. Moreover, the four-wave-mixing has been realized in the submicron Ta2O5 channel waveguide.
Nonstoichiometric Si1−xGex films fabricated by plasma enhanced chemical vapor deposition (PECVD) with different flounce ratios are demonstrated to show the composition ratio dependent optical properties, including refractive index, bandgap and optical absorption. By increasing the fluence ratio from 0.2 to 0.5, the refractive index of Si1−xGex film raises from 3.527 to 3.927, with the absorption coefficient...
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